Power Angel shows this X58 OC mode max power consumption is 636W
According to 80Plus website, there are only 20, 50 and 100% transfer efficiency.
I decide to use transfer efficiency at 100% and itís about 88.11%
After transferring, 110V 636W is around 560W real output.

3.3V
The highest is 3.33V and mostly itís between 3.28~3.3V during test. The voltage wave is around 1.50%

5V
Mostly itís between 4.87~4.76V. The voltage wave is around 2.26%.

12V
The highest is 12.3V and the mostly is between 12.18~12.24V. The voltage wave is 0.96%.

3V and 5V voltage wave is around 1.5% and 2.26%.

Even 12V is only 1.05%. You can see this PSU in high load condition is still working excellent.

3V and 5V voltage wave is around 1.50 and 2.26%.
The wave range is higher than default mode. However, itís still much lower than acceptable 5% tolerance.
12V is even lower. Itís just only 0.96%. You can see this PSU in 75% high load condition is still working excellent.

Using More Accurate Meter
Idle
5V testing result is 5.05V which is higher than board meterage 4.87V.

OCCT Full Speed
The voltage is 5.06V which is lower than idle condition around 0.1V